/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.plugin.task.chunjun;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.SystemUtils;

import org.apache.dolphinscheduler.common.utils.JSONUtils;
import org.apache.dolphinscheduler.plugin.task.api.AbstractTask;
import org.apache.dolphinscheduler.plugin.task.api.ShellCommandExecutor;
import org.apache.dolphinscheduler.plugin.task.api.TaskCallBack;
import org.apache.dolphinscheduler.plugin.task.api.TaskConstants;
import org.apache.dolphinscheduler.plugin.task.api.TaskException;
import org.apache.dolphinscheduler.plugin.task.api.TaskExecutionContext;
import org.apache.dolphinscheduler.plugin.task.api.model.Property;
import org.apache.dolphinscheduler.plugin.task.api.model.TaskResponse;
import org.apache.dolphinscheduler.plugin.task.api.parameters.AbstractParameters;
import org.apache.dolphinscheduler.plugin.task.api.parser.ParamUtils;
import org.apache.dolphinscheduler.plugin.task.api.parser.ParameterUtils;
import org.apache.dolphinscheduler.spi.enums.Flag;

import java.io.File;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.nio.file.attribute.FileAttribute;
import java.nio.file.attribute.PosixFilePermission;
import java.nio.file.attribute.PosixFilePermissions;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;

import static org.apache.dolphinscheduler.plugin.task.api.TaskConstants.EXIT_CODE_FAILURE;
import static org.apache.dolphinscheduler.plugin.task.api.TaskConstants.RWXR_XR_X;

/**
 * chunjun task
 */
public class ChunJunTask extends AbstractTask {
  /**
   * chunjun path
   */
  private static final String CHUNJUN_PATH = "${CHUNJUN_HOME}/bin/start-chunjun";

  /**
   * chunjun dist
   */
  private static final String CHUNJUN_DIST_DIR = "${CHUNJUN_HOME}/chunjun-dist";

  /**
   * chunJun parameters
   */
  private ChunJunParameters chunJunParameters;

  /**
   * shell command executor
   */
  private ShellCommandExecutor shellCommandExecutor;

  /**
   * taskExecutionContext
   */
  private TaskExecutionContext taskExecutionContext;

  public ChunJunTask(TaskExecutionContext taskExecutionContext) {
    super(taskExecutionContext);
    this.taskExecutionContext = taskExecutionContext;

    this.shellCommandExecutor = new ShellCommandExecutor(this::logHandle,
        taskExecutionContext, logger);
  }

  /**
   * init chunjun config
   */
  @Override
  public void init() {
    logger.info("chunjun task params {}", taskExecutionContext.getTaskParams());
    chunJunParameters = JSONUtils.parseObject(taskExecutionContext.getTaskParams(), ChunJunParameters.class);

    if (!chunJunParameters.checkParameters()) {
      throw new RuntimeException("chunjun task params is not valid");
    }
  }

  /**
   * run chunjun process
   *
   * @throws TaskException exception
   */
  @Override
  public void handle(TaskCallBack taskCallBack) throws TaskException {
    try {
      Map<String, Property> paramsMap = taskExecutionContext.getPrepareParamsMap();

      String jsonFilePath = buildChunJunJsonFile(paramsMap);
      String shellCommandFilePath = buildShellCommandFile(jsonFilePath, paramsMap);
      TaskResponse commandExecuteResult = shellCommandExecutor.run(shellCommandFilePath);

      setExitStatusCode(commandExecuteResult.getExitStatusCode());

      // todo get applicationId
      setAppIds(String.join(TaskConstants.COMMA, Collections.emptySet()));
      setProcessId(commandExecuteResult.getProcessId());
    } catch (InterruptedException e) {
      Thread.currentThread().interrupt();
      logger.error("The current ChunJun Task has been interrupted", e);
      setExitStatusCode(EXIT_CODE_FAILURE);
      throw new TaskException("The current ChunJun Task has been interrupted", e);
    } catch (Exception e) {
      logger.error("chunjun task failed.", e);
      setExitStatusCode(EXIT_CODE_FAILURE);
      throw new TaskException("Execute chunjun task failed", e);
    }
  }

  /**
   * build chunjun json file
   *
   * @param paramsMap
   * @return
   * @throws Exception
   */
  private String buildChunJunJsonFile(Map<String, Property> paramsMap)
      throws Exception {
    // generate json
    String fileName = String.format("%s/%s_job.json",
        taskExecutionContext.getExecutePath(),
        taskExecutionContext.getTaskAppId());

    String json = null;

    Path path = new File(fileName).toPath();
    if (Files.exists(path)) {
      return fileName;
    }

    if (chunJunParameters.getCustomConfig() == Flag.YES.ordinal()) {
      json = chunJunParameters.getJson().replaceAll("\\r\\n", "\n");
    }

    // replace placeholder
    json = ParameterUtils.convertParameterPlaceholders(json, ParamUtils.convert(paramsMap));

    logger.debug("chunjun job json : {}", json);

    // create chunjun json file
    FileUtils.writeStringToFile(new File(fileName), json, StandardCharsets.UTF_8);
    return fileName;
  }

  /**
   * create command
   *
   * @return shell command file name
   * @throws Exception if error throws Exception
   */
  private String buildShellCommandFile(String jobConfigFilePath, Map<String, Property> paramsMap)
      throws Exception {
    // generate scripts
    String fileName = String.format("%s/%s_node.%s",
        taskExecutionContext.getExecutePath(),
        taskExecutionContext.getTaskAppId(),
        SystemUtils.IS_OS_WINDOWS ? "bat" : "sh");

    Path path = new File(fileName).toPath();

    if (Files.exists(path)) {
      return fileName;
    }

    // chunjun command
    List<String> args = new ArrayList<>();

    args.add(CHUNJUN_PATH);
    args.add("-mode");
    args.add(getExecMode(chunJunParameters));
    args.add("-jobType sync");
    args.add("-job");
    args.add(jobConfigFilePath);
    args.add("-chunjunDistDir");
    args.add(CHUNJUN_DIST_DIR);

    if (!"local".equalsIgnoreCase(getExecMode(chunJunParameters))) {
      args.add("-flinkConfDir");
      args.add(ChunJunConstants.FLINK_CONF_DIR);

      args.add("-flinkLibDir");
      args.add(ChunJunConstants.FLINK_LIB_DIR);

      args.add("-hadoopConfDir");
      args.add(ChunJunConstants.HADOOP_CONF_DIR);
    }

    if (chunJunParameters.getOthers() != null) {
      args.add(chunJunParameters.getOthers());
    }

    String command = String.join(" ", args);

    // replace placeholder
    String chunjunCommand = ParameterUtils.convertParameterPlaceholders(command, ParamUtils.convert(paramsMap));

    logger.info("raw script : {}", chunjunCommand);

    // create shell command file
    Set<PosixFilePermission> perms = PosixFilePermissions.fromString(RWXR_XR_X);
    FileAttribute<Set<PosixFilePermission>> attr = PosixFilePermissions.asFileAttribute(perms);

    if (SystemUtils.IS_OS_WINDOWS) {
      Files.createFile(path);
    } else {
      Files.createFile(path, attr);
    }

    Files.write(path, chunjunCommand.getBytes(), StandardOpenOption.APPEND);

    return fileName;
  }

  public String getExecMode(ChunJunParameters chunJunParameters) {
    if (chunJunParameters.getDeployMode() == null) {
      return "local";
    }
    return chunJunParameters.getDeployMode();
  }

  /**
   * get task parameters
   *
   * @return AbstractParameters
   */
  @Override
  public AbstractParameters getParameters() {
    return chunJunParameters;
  }

  /**
   * cancel ChunJun process
   *
   * @throws Exception if error throws Exception
   */
  @Override
  public void cancel() throws TaskException {
    // cancel process
    try {
      shellCommandExecutor.cancelApplication();
    } catch (Exception e) {
      throw new TaskException("cancel application error", e);
    }
  }

}
